[meteorite-list] Asteroids May Not Be Planet Building Blocks After All
From: Shawn Alan <shawnalan_at_meteoritecentral.com>
Date: Fri, 16 Jan 2015 11:26:50 -0700
I thought it was the 7 days of creation that started life on Earth.
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Asteroids May Not Be Planet Building Blocks After All
by Charles Q. Choi, Space.com Contributor | January 16, 2015 07:00am
Asteroids have long been regarded as planetary building blocks. But they
may actually be byproducts of planet formation, born when violent
collisions smashed an earlier generation of objects apart, a new study
Asteroid fragments that fall to Earth as meteorites often contain tiny,
round pellets called chondrules that formed when molten droplets quickly
cooled in space in the solar system's early years. Chondrules are found
in 92 percent of all meteorites, and are often thought to be the
building blocks of planets.
Chondrules were part of the protoplanetary disc of gas and dust
surrounding the newborn sun that gave birth to Earth and the other
planets. A recent study found that chondrules formed about 1 million
years after planetesimals ? the building blocks of protoplanets ?
came together. [When Space Attacks: The 6 Craziest Meteor Impacts]
Prior research had suggested that chondrules in some meteorites were
probably born when rocks in space collided at speeds of more than 22,370
mph (36,000 km/h). However, it was uncertain how the majority of
Received on Fri 16 Jan 2015 01:26:50 PM PST